CLEARANCE HOLES FOR METRIC FASTENERS

"Clearance holes for metric fasteners" calculator was developed to calculate the
recommended clearance hole sizes from M1.6 through M64 for bolts, screws and
studs in three classes of clearance using close-, normal- and loose-fit
category. The recommended metric drill bit size for each class of clearance hole is shown in calculation results. The calculator also shows nearest substitute inch drill bit size for
metric fasteners.

This calculator was developed by using the charts which are given in the ASME B18.2.8-1999 - " Clearance holes for bolts, screws and studs" standard.

Metric Clearance Hole Calculator:

INPUT PARAMETERS

Nominal Screw Size

Fit Class

Please Wait...

RESULTS

Parameter

Value

Nominal Screw Size

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mm

Fit Class

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--

Nominal Metric Drill Size

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mm

Nearest Inch Drill Size

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in

Minimum Hole Diameter

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mm

Maximum Hole Diameter

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Definitions:

Clearance hole: A hole on a part
where threaded section of a bolt can pass.